The Level Monitor is intended to measure the level of input; the audio samples are sent to the output without modification.
Use case: This object can be deployed in Level Monitor mode whenever there is a need to measure the level of signal level and in Clip Meter mode to check if the level is causing clipping. The same input is sent as output without modification.
Level Monitor Properties
Below table describes the Level Monitor audio object properties and functionality.
| Properties | Descriptions |
| # of Channels | In the Signal Flow Designer (SFD), the number of control outputs is equal to the number of audio channels. Each control output writes out the channel level/clip indication value based on the MODE selected.
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| Display Name | Display the name of the Level Monitor audio object in signal flow design. It can be changed based on the intended usage of the object. |
| Object Mode | During design time, the audio object channel can be configured in one of the two operation modes.
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Mode
During design time, the audio object can be configured in one of the two operation modes.
- Level Monitor
- Clip Meter
| Mode | Description |
| Level Monitor | This is the default mode.
In this mode, the signal level is measured and the value is sent to the control output. |
| Clip Meter | In this mode, the object computes the signal level and compares it with the threshold set through the tuning parameters. A flag is set/reset if the signal level is above/below the threshold and this flag is sent to the control output. |
Additional Parameters
There are no additional parameters available for the Level Monitor audio object.
Tuning Parameters
Under Level Monitor mode, the following are the tuning parameters available for each channel.
| Parameter | Description | Range | Default | Data Type | Unit |
| LEV_MODE | To select the method of computation of the input signal level
In all the above types, the computed level is always presented in dB (logarithmic scale) |
0 – RMS
1 – LINEAR 2 – PEAK |
0 | Float | NA |
| DB_LEAK_PER_SEC | Amount of dB drop per second in Peak Level mode. | 1 to 60 | 30 | Float | dB |
| PEAK_HOLD_TIME | Amount of time peak is held. | 0 to 1 | 0.05 | Float | second |
Under Clip Meter mode, the following is the tuning parameter available for each channel.
| Parameter | Description | Range | Default | Data Type | Unit |
| Threshold | The threshold value for the channel to treat a signal as being clipped. | -20 to 20 | -0.25 | Float | dB |
State Parameters
Under Level Monitor mode, the following is the state parameter available for each channel.
| Parameter | Description | Range | Default | Data Type | Unit |
| LEVEL_VALUE | Measured signal level for the channel | -128 to 20 | 0 | Float | dB |
Under Clip Meter mode, the following is the state parameter available for each channel.
| Parameter | Description | Range | Default | Data Type | Unit |
| Clip Indicator | Clip Indicator for the channel based on the tuned threshold parameter | 0 or 1 | 0 | Unsigned Long | None |
Control Interface
Under Level Monitor mode, the following is the control output available for each channel.
| Parameter | Description | Range | Data Type | Unit |
| Signal Level | Measured signal level for the channel | -128 to 20 | Float | dB |
Under Clip Meter mode, the following is the control output available for each channel.
| Parameter | Description | Range | Data Type | Unit |
| Clip Indicator | Clip Indicator per channel based on the tuned threshold parameter | 0 or 1 | Float | None |